Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1643079 > unrolled thread

Re: [PATCH v8 07/10] powerpc/perf: PMU functions for Core IMC and hotplugging

Back to article view | Back to linux.kernel

This discussion starts older than the indexed window; earlier articles aren't shown. The article labeled Started by below is the oldest one visible, not the original post.

Contents

  Re: [PATCH v8 07/10] powerpc/perf: PMU functions for Core IMC and hotplugging Stewart Smith <stewart@linux.vnet.ibm.com> - 2017-05-17 10:00 +0200

#1643079 — Re: [PATCH v8 07/10] powerpc/perf: PMU functions for Core IMC and hotplugging

Anju T Sudhakar <anju@linux.vnet.ibm.com> writes:
> --- a/arch/powerpc/include/asm/imc-pmu.h
> +++ b/arch/powerpc/include/asm/imc-pmu.h
> @@ -24,6 +24,7 @@
>   */
>  #define IMC_MAX_CHIPS			32
>  #define IMC_MAX_PMUS			32
> +#define IMC_MAX_CORES			32
>
>  /*
>   * This macro is used for memory buffer allocation of
> @@ -38,6 +39,11 @@
>  #define IMC_NEST_MAX_PAGES		64
>
>  /*
> + * IMC Core engine expects 8K bytes of memory for counter collection.
> + */
> +#define IMC_CORE_COUNTER_MEM		8192

Any reason for this not to be in the device tree?

This is the size of memory that Linux needs to give OPAL, so the size of
that should probably come from OPAL rather than Linux.

Otherwise, if in the future, we had a counter with an offset greater
than 8192 in, we'd have no way to detect that and we'd fail silently by
overwriting memory.

-- 
Stewart Smith
OPAL Architect, IBM.

[toc] | [standalone]

Back to top | Article view | linux.kernel

csiph-web